Synthesis writing is a common activity in both upper-secondary and higher education (Raedts et al., 2017;Van Ockenburg et al., 2019), as the act of synthesizing is the highest cognitive operation for comprehension, useful in academic and workplace contexts (Leijten et al., 2014). Producing synthesis texts is considered to be an important learning task in education because of its epistemic value. Synthesis tasks have a high learning potential as the reading, rereading, integration, organization and elaboration of different source texts calls for knowledge transformation (Solé et al., 2013;Spivey & King, 1989). Independently of the field of study, all students will write multiple types of synthesis texts during their academic career. Students find it challenging, which is not surprising given the cognitively demanding nature of the task (